Withholding & Estimated Payments (2025)

Review withholding (Form W-4) and make estimated tax payments when you have significant non-wage income. Proper withholding/estimated payments help avoid underpayment penalties.

Practical steps

• Use the IRS withholding estimator to update Form W-4 when life events or income changes occur.
• For self-employed or investment income, make quarterly estimated payments to avoid penalties.
• Consider safe-harbor rules (e.g., paying 90% of current year tax or 100%/110% of prior-year tax depending on AGI) — verify 2025 thresholds.

Confirm 2025 safe-harbor percentages and limits on IRS.gov before relying on them for planning.